Recharging a Tesla battery by going down a hill.

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Recharging a Tesla battery by going down a hill.

John Magness
I may be confused about the formula that Jason used for Potential Energy. If the formula is PE=mgh where m is mass and g is the force of gravity. I may be wrong but I thought that weight is mass x the force of gravity. Is the formula for PE being used in the presentation using weight x the force of gravity?  
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